Faunal dynamics of juvenile gastropods and associated organisms across the Valanginian transgression-regression cycle in central Poland
Faunal dynamics of juvenile gastropods and associated organisms across the Valanginian transgression-regression cycle in central Poland
复制标题
波兰中部瓦兰吉尼阶海侵-回归周期中幼年腹足动物和相关生物的区系动态
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Kaim
中科院分区：
文献类型：
--
作者：
A. Kaim
摘要波兰中部瓦瓦尔的Valanginian化石组合以幼年腹足类为主，主要是浮游幼虫，因此它们的分布在很大程度上与当地的底环境无关。腹足类占主导地位的协会显示出一种模式的物种营业额，这是令人惊讶的一致的海平面变化周期和变化在pneumeographic provincialism，也强烈表达在菊石的分布。Valanginian海从北部扩展到波兰中部，带来了寒冷的沃茨和北方动物群，在不断加深的海底，底栖大型生物的多样性减少。在晚期瓦兰吉尼亚高峰期早期，连接北欧海和喀尔巴阡海的海道扩张到足以让特提斯生物迁移到波兰中部。在晚瓦兰吉尼晚期，这种海平面变化趋势发生逆转，北方动物群再次取代了特提斯动物群。底栖有孔虫测试中的同位素记录表明，尽管海平面发生了变化，但底层水温保持相对稳定。
Abstract The Valanginian fossil assemblages at Wawal in central Poland are dominated by juvenile gastropods with planktotrophic, mostly pelagic larvae, their occurrence thus being largely independent of local bottom environment in their distribution. The gastropod-dominated associations show a pattern of species turnover that is surprisingly consistent with a eustatic cycle and changes in biogeographic provincialism, both also strongly expressed in the distribution of ammonites. The Valanginian sea expanded into central Poland from the north, bringing cold waters with boreal faunas, and on the deepening sea-bottom the diversity of benthonic macro-organisms decreased. During the early Late Valanginian highstand, the seaway connecting the North European sea with the Carpathian ocean expanded enough to allow migration of Tethyan organisms into central Poland. In the late Late Valanginian this eustatic trend reversed and Boreal faunas again replaced those from the Tethys. The isotope record in benthonic foraminiferal tests suggests that, despite the sea-level changes, the bottom-water temperatures remained relatively stable.